Frequency analysis on image resizing (Resize factor = 0.75). We show exemplary images from citysc, Monet, and facades categories (in the 1st column), resized images (in the 2nd column), difference maps (in the 3rd column), spectra of original images (in the 4th column) and spectra of resized images (in the 5th column). For ease of comparison, we resize original images to smaller size and resize them back to original size and compute the pixel-wise difference between the two to yield the difference map.